RE: DNS ACL ?

["Maher Odeh" <rax () netvision net il>]

Hi John,
Correct, 53/UDP is used for DNS Queries and 53/TCP is used for Zone
transfers yet it's not always like this
MS uses 53/TCP for queries as well, but mainly the UDP is used for
queries

Thanks
 

-----Original Message-----
From: John Hally [mailto:JHally () epnet com] 
Sent: Friday, November 11, 2005 3:35 PM
To: 'pen-test () securityfocus com'
Subject: DNS ACL ?

Hello All,

 

I need a sanity check regarding DNS ACLs.  For external facing DNS
servers you need to allow only udp/53 inbound, correct?  I know tcp/53
is used for zone transfers and requests/replies greater than a certain
size, but they shouldn't typically happen for general dns queries
correct?  

 

Thanks in advance!



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